JP5185667B2 - Blade drive device - Google Patents

Description

  The present invention relates to a blade driving device.

  2. Description of the Related Art Conventionally, blade driving devices used for cameras and the like are known. Patent Document 1 includes a first arm attached to a rotor shaft, and a first elongated hole that is swingably attached to a support shaft that protrudes from the main plate and engages with a first operating pin provided on the first arm. A sector drive device having a second arm provided and a blade (sector) provided with a second elongated hole that engages with a second operating pin provided on the second arm is disclosed. By providing the first and second arms, the amount of movement of the blades can be increased.

JP 2006-84895 A

  According to the apparatus disclosed in Patent Document 1, since it is necessary to provide two arms, the number of parts increases and the apparatus becomes complicated.

  In addition, the amount of movement of the drive pin can be ensured simply by increasing the distance from the center of rotation of the arm to the drive pin, thereby ensuring the amount of movement of the blade. However, if the distance from the center of rotation of the arm to the drive pin is increased, the length of the arm increases, so it is necessary to secure a large space in the blade drive device that allows the rotation of the arm. If such a space is ensured, the blade driving device is enlarged.

  Then, this invention makes it a subject to provide the blade drive device which is simple structure and can ensure the movement amount of a blade | wing, maintaining size reduction.

  The object is to adjust the opening amount of the opening that is supported so as to be able to move in a straight line, the blade having the first and second engagement holes, and the predetermined range to rotate the substrate. A driving member that drives the blade; and an arm that is provided on the driving member and transmits the driving force of the driving member to the blade. The arm engages with the first and second engagement holes, respectively. This can be achieved by a blade drive device provided with first and second drive pins.

  With this configuration, since the arm is provided with the first and second drive pins, even if the length of the arm is shortened, the amount of movement of the blades can be changed without changing the rotation range of the arm. Can be secured. Therefore, the amount of movement of the blades can be ensured while maintaining a small size with a simple structure.

In the above configuration,
The first and second drive pins may employ a configuration in which the first and second drive pins are arranged in a circumferential direction around the rotation center of the arm. Thereby, the movement amount of a blade | wing can be ensured, without changing the rotation range of an arm.

  The said structure WHEREIN: The said 1st and 2nd engagement hole can employ | adopt the structure provided so that it might mutually follow. As a result, the first and second drive pins can be arranged in a minimum space, so that the amount of movement of the blades can be ensured while maintaining downsizing.

  In the above configuration, the first engagement hole includes a drive section in which the power of the first drive pin is transmitted to the blades and a non-drive section in which the power of the first drive pin is released, and the second engagement The joint hole includes a drive section in which the power of the second drive pin is transmitted to the blades and a non-drive section in which the power of the second drive pin is released, and one of the first and second drive pins is When located in the drive section, a configuration in which the other is located in the non-drive section can be adopted.

  With this configuration, since the arm portion is provided with a plurality of drive pins that engage with the engagement holes, the amount of movement of the pin can be ensured even when the length of the arm portion is short. .

  The said structure WHEREIN: The said drive member and a blade | wing are located so that the said board | substrate may be pinched | interposed, and the said board | substrate can employ | adopt the structure which has a single escape hole which escapes the said 1st and 2nd drive pin. As a result, since there is only one escape hole, the degree of freedom of arrangement of the mounting holes of the actuators and the like increases, so that the space of the board can be used effectively and the amount of movement of the blades is ensured while maintaining downsizing be able to.

  ADVANTAGE OF THE INVENTION According to this invention, the blade | wing drive device which is simple structure and can ensure the movement amount of a blade | wing can be provided, maintaining size reduction.

  Hereinafter, a blade driving device according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the blade driving device 1 according to the first embodiment, and FIG. 2 is a perspective view of the blade driving device 1 according to the first embodiment, in which a part of the substrate 10 is omitted. The blade driving device 1 includes a substrate 10 having an opening 11 at the center, a blade 20 that is supported so as to be able to move straight forward while adjusting the opening amount of the opening 11, and a driving member that is supported so as to be rotatable and drives the blade 20. 30, including an electromagnetic actuator 40 that drives the drive member 30. The blade 20 and the electromagnetic actuator 40 are arranged so as to sandwich the substrate 10.

  The electromagnetic actuator 40 includes a stator 41 formed in a U-shape and having magnetic poles at both ends thereof, a rotor 42 magnetized in two circumferentially different poles to form a cylindrical shape, and a coil bobbin attached to an arm of the stator 41 43, a coil 44 wound around the coil bobbin 43 is included. When the coil 44 is energized, the magnetic pole portions described above are excited to have different polarities, and the rotor 42 is rotated by the attractive force and the repulsive force generated between the rotor 42 and the magnetic pole portion.

  The drive member 30 is fixed to the rotor 42 and rotates together with the rotor 42 within a predetermined angle range. The drive member 30 is made of resin. Further, the drive member 30 includes an arm 32 extending radially outward from the rotation center of the drive member 30, that is, the rotation center of the rotor 42, and drive pins 33 a and 33 b erected from the tip of the arm 32. . The arm 32 transmits the driving force of the driving member 30 to the blade 20 engaged with the driving pins 33a and 33b. The arm 32 is formed so as to increase in width as it moves away from the rotation center of the drive member 30.

  The substrate 10 is made of resin, and the substrate 10 is formed with a single escape hole 13 in an arc shape for allowing both the drive pins 33a and 33b to escape. Further, the blade 20 is formed of a general light reflection preventing film or a light shielding film, for example, a Soma black film (manufactured by Somaru), and the blade 20 is engaged with the drive pins 33a and 33b, respectively. Holes 23a and 23b are formed. The engagement holes 23a and 23b are substantially linear and are formed along each other. FIG. 3 is a front view of the blade 20. A diaphragm aperture 21 having a smaller diameter than the aperture 11 is formed in the blade 20.

  The substrate 10 is formed with guide pins 12a and 12b, and the blade 20 is formed with guide holes 22a and 22b that engage with the guide pins 12a and 12b, respectively. The guide holes 22a and 22b are linear and formed in parallel. The guide holes 22a and 22b have a function of guiding the blade 20 so that the movement of the blade 20 is in a straight traveling direction. The guide holes 22a and 22b and the engagement holes 23a and 23b are not parallel.

  Further, as shown in FIG. 3, the engagement hole 23a includes a drive section 23ad and a non-drive section 23an, and the engagement hole 23b similarly includes a drive section 23bd and a non-drive section 23bn. When the drive pin 33a is positioned in the drive section 23ad, the power of the drive pin 33a is transmitted to the blades 20. When the drive pin 33a is located in the non-drive section 23an, the power of the drive pin 33a is released. Similarly, when the drive pin 33 b is positioned in the drive section 23 bd, the power of the drive pin 33 b is transmitted to the blade 20. When the drive pin 33b is located in the non-drive section 23bn, the power of the drive pin 33b is released. Further, in the engaging hole 23a, the driving section 23ad and the non-driving section 23an continue in this order from the lower left to the upper right in FIG. 3, whereas in the engaging hole 23b, the lower left in FIG. From the top to the upper right, the non-driving section 23bn and the driving section 23bd are consecutive in this order. The non-drive section 23an is formed wider than the drive section 23ad, and similarly, the non-drive section 23bn is formed wider than the drive section 23bd. Details will be described later.

  Next, the operation of the blade driving device 1 will be described. 4 is a front view of the blade driving device 1 in the fully open state, FIG. 5 is a front view of the blade driving device 1 in the middle of the transition between the fully opened and small aperture states, and FIG. 6 is a blade drive in the small aperture state. 2 is a front view of the device 1. FIG. 4 to 6, the substrate 10 is indicated by a broken line, and the rotor 42 of the electromagnetic actuator 40 and the driving member 30 are indicated by a solid line in order to make the operation of the blade driving device 1 easier to understand. .

  As shown in FIG. 4, in the fully opened state, the blade 20 is positioned at a position retracted from the opening 11. Further, in this state, the drive pin 33b abuts on one end of the escape hole 13, and the clockwise rotation of the drive member 30 is restricted. The guide pins 12a and 12b are also in contact with the ends of the guide holes 22a and 22b, respectively, and the movement of the blade 20 in the direction away from the opening 11 is restricted.

  The drive pins 33a and 33b are provided on the arm 32 so as to be arranged in the circumferential direction around the rotation center C of the drive member 30 (rotation center of the rotor 42). Specifically, the drive pins 33 a and 33 b are formed at positions having a distance R from the rotation center C of the drive member 30. Further, the drive pins 33a and 33b are separated from each other by a predetermined distance in the circumferential direction. In other words, the drive pins 33 a and 33 b are arranged so that a line connecting them intersects a radial line from the rotation center C of the arm 32.

  When the rotor 42 rotates counterclockwise from the state shown in FIG. 4, the drive member 30 also rotates counterclockwise. When the drive member 30 rotates, the drive pins 33a and 33b move in the escape hole 13 in the counterclockwise direction. During this movement, the drive pin 33a is in sliding contact with the inner peripheral surface of the engagement hole 23a in the drive section 23ad, and the power of the drive pin 33a is transmitted to the blade 20. On the other hand, the drive pin 33b is not in sliding contact with the inner peripheral surface of the engagement hole 23b in the non-drive section 23bn, and the movement of the drive pin 33b is released. Thus, the power of the electromagnetic actuator 40 is transmitted to the blades 20 through the drive pin 33a.

  Thus, when the rotor 42 rotates counterclockwise, the blade 20 moves in the diagonally downward left direction along the direction of the guide holes 22a and 22b. In other words, the blade 20 relatively moves in the diagonally downward left direction so that the drive pins 33a and 33b move up in the engagement holes 23a and 23b, respectively. Thereby, it shifts to the state shown in FIG.

  In the state shown in FIG. 5, the drive pin 33a is located near the boundary between the drive section 23ad and the non-drive section 23an, and the drive pin 33b is similarly located near the boundary between the drive section 23bd and the non-drive section 23bn. Is shown. In this state, both of the drive pins 33a and 33b are in contact with the inner peripheral surfaces of the engagement holes 23a and 23b, respectively. When the rotor 42 further rotates counterclockwise from this state, the drive pin 33a leaves the drive section 23ad and enters the non-drive section 23an. The drive pin 33b leaves the non-drive section 23bn and enters the drive section 23bd. As a result, the drive pin 33a releases power by the non-drive section 23an, but the drive pin 33b contacts the inner peripheral surface of the drive section 23bd, and the power of the drive pin 33b is transmitted to the blades 20. Thus, when the rotor 42 further rotates counterclockwise from the state shown in FIG. 5, the power of the electromagnetic actuator 40 is transmitted to the blades 20 via the drive pins 33 b.

  The state shown in FIG. 6 shows a state in which the drive pin 33a is in contact with the other end of the escape hole 13 and the rotation of the drive member 30 in the counterclockwise direction is restricted. At this time, the guide pins 12a and 12b are also in contact with the other ends of the guide holes 22a and 22b, respectively, and the further movement of the blade 20 in the diagonally lower left direction is restricted. At this time, the opening 11 and the aperture opening 21 overlap. The state shown in FIG. 6 shifts to the state shown in FIGS. 5 and 4 when the rotor 42 rotates in the clockwise direction again.

  As described above, in the transition process between the fully open state and the small aperture state, the role of transmitting the power of the electromagnetic actuator 40 to the blade 20 is switched from one of the drive pin 33a and the drive pin 33b to the other. In other words, the engagement holes 23 a and 23 b are formed so that any one of the drive pins 33 a and 33 b is transmitted to the blade 20 during the movement of the blade 20. This is because the two drive pins 33 a and 33 b are provided at the tip of the arm 32.

  For example, when the engagement holes 23a and 23b are formed substantially in parallel and both of them are always in sliding contact with the drive pins 33a and 33b over the entire section, the sliding resistance is partially increased, and the drive member This is because 30 does not rotate smoothly. More specifically, the distance between the drive pins 33a and 33b is always constant, but the rotation of the drive member 30 causes the distance between the drive pins 33a and 33b in the direction perpendicular to the direction in which the engagement holes 23a and 23b extend. This is because the distance changes. For example, when the engagement holes 23a and 23b are always in sliding contact with the drive pins 33a and 33b over the entire section in the position shown in FIG. 5, in the state shown in FIGS. 4 and 6, the drive pins 33a and 33b This is because the distance between the engagement holes 23a and 23b becomes longer than the distance between them, and the sliding resistance between the drive pins 33a and 33b and the engagement holes 23a and 23b increases.

  The reason why the arm 32 is provided with the two drive pins 33a and 33b will be described below.

  First, a conventional blade driving device 1x will be described. FIG. 7 is a front view of the conventional blade driving device 1x in the fully opened state, and FIG. 8 is a front view of the conventional blade driving device 1x in the small aperture state. For ease of understanding, the substrate 10x is indicated by a broken line, and other portions are omitted.

  The blade driving device 1x has the blade 20x, and the movement amount of the blade 20x is substantially the same as that of the blade 20 of the blade driving device 1. The drive member 30x includes an arm 32x and a drive pin 33x. A single drive pin 33x is erected at the tip of the arm 32x. The board 10x is formed with a relief hole 13x for allowing the drive pin 33x to escape, and the blade 20x is formed with a single engagement hole 23x for engaging with the drive pin 33x. The engagement hole 23x is formed in a linear shape. Further, the engagement hole 23x is always in sliding contact with the drive pin 33x in all sections. That is, the engagement hole 23x is configured so that the power of the drive pin 33x can be always transmitted to the blade 20. In the blade 20x, a single guide hole 22x that engages with the guide pins 12ax and 12bx formed in the substrate 10x is linearly formed. As with the blade driving device 1 according to the present embodiment, the blade driving device 1x rotates from the fully open state shown in FIG. 7 to the small aperture state shown in FIG. 8 by rotating the driving member 30x counterclockwise. And migrate.

  4 and 7, the distance Rx from the rotation center Cx of the drive member 30x to the drive pin 33x is the drive pin from the rotation center C of the drive member 30 of the blade driving device 1 according to this embodiment. It is longer than the distance R to 33a, 33b. This is because it is necessary to secure the amount of movement of the drive pin in order to secure the amount of movement of the blade that moves straight, and in order to ensure the amount of movement of the drive pin, the drive is performed from the center of rotation of the arm. This is because a longer distance to the pin is preferable. This is because, when the rotation range of the drive member is constant, the movement amount of the drive pin is larger as the distance from the rotation center of the arm to the drive pin is longer. However, as shown in FIG. 7, when the distance Rx from the rotation center Cx of the drive member 30x to the drive pin 33x is long, it is necessary to secure a large space in the blade drive device 1x that allows the drive member 30x to rotate. And the blade driving device 1x is enlarged.

  However, if the length of the arm is shortened, the blade driving device can be reduced in size, but the movement amount of the driving pin is also reduced accordingly. Therefore, the moving amount of the blade cannot be ensured. As a solution to this, it is conceivable to secure the amount of movement of the drive pin by expanding the rotation range of the rotor. However, in order to expand the rotation range of the rotor, there are problems such as strict position setting of the magnetic pole portion formed on the stator facing the rotor and securing of torque, and the rotation range of the rotor is expanded. It is desirable that the amount of movement of the drive pin can be ensured without this.

  Therefore, as in the blade driving device 1 according to the present embodiment, by providing the arm 32 with the two driving pins 33a and 33b, the movement amount of the blade 20 is ensured without expanding the rotation range of the rotor 42. can do.

  This point will be described in detail. As shown in FIGS. 6 and 8, the lengths of the escape holes 13 and 13x are substantially the same. However, the movement amount D of the drive pin 33b is shorter than the movement amount Dx of the drive pin 33x. This is because the drive pin 33b abuts at one end of the escape hole 13 in the fully open state and the drive pin 33a abuts at the other end of the escape hole 13 in the throttled state, whereas in the blade drive device 1x, This is because, in any state, the single drive pin 33x contacts one end or the other end of the escape hole 13x. That is, in the case of the blade driving device 1 according to the present embodiment, the rotation range of the driving member 30 can be reduced by the distance between the driving pins 33a and 33b. Thereby, the movement amount of the blade | wing 20 can be ensured, without enlarging the rotation range of the rotor 42, and size reduction of the blade drive device 1 can be maintained. Further, as in the blade driving device 1 according to the present embodiment, the movement of the blade 20 is maintained while maintaining the downsizing of the device by a simple structure in which two driving pins 33a and 33b are provided at the tip of the arm 32. The amount can be secured.

  Next, a blade driving device 1A according to the second embodiment will be described. 9 to 11 are explanatory views of the blade driving device 1A according to the second embodiment. FIG. 9 is a front view of the blade driving device 1A according to the second embodiment in the fully opened state, and FIG. 10 is a front view of the blade driving device 1A according to the second embodiment in the middle of the transition between the fully opened and small aperture states. 11 is a front view of the blade driving device 1A according to the second embodiment in a small aperture state. In FIG. 9 to FIG. 11, in order to make the operation of the blade driving device 1 </ b> A easy to understand, the operation is shown by a broken line of the substrate 50, and other components are omitted. The blade driving device 1A is a so-called guillotine shutter.

  As illustrated in FIGS. 9 to 11, the blade driving device 1 </ b> A includes a substrate 50, a blade 60, and the like. The substrate 50 is formed in a rectangular shape. An opening 51 is formed in the substrate 50. A diaphragm opening 61 is formed in the blade 60. Guide pins 52 a and 52 b are formed on the substrate 50, and the guide pins 52 a and 52 b engage with guide holes 62 a and 62 b formed in the blade 60, respectively. The guide holes 62a and 62b are formed substantially in parallel. As the guide holes 62a and 62b engage with the guide pins 52a and 52b, respectively, the blade 60 is supported to move in the longitudinal direction of the substrate 50. The substrate 50 is formed with a single escape hole 53 for escaping the movement of both the drive pins 33a and 33b.

  The blade 60 is formed with engagement holes 63a and 63b that engage with the drive pins 33a and 33b, respectively. Similarly to the blade driving device 1 according to the first embodiment, the engagement holes 63a and 63b also have a driving section 63ad and a non-driving section 63an, a driving section 63bd, and a non-driving section 63bn, respectively.

  In addition, the blade driving device 1A employs an electromagnetic actuator as a drive source, similarly to the blade driving device 1 according to the first embodiment. 9 to 11, only the rotor 42 is shown for the electromagnetic actuator.

  In the fully open state, the drive pin 33a is located in the drive section 63ad, and the drive pin 33b is located in the non-drive section 63bn. When the rotor 42 rotates counterclockwise from this state, the blade 60 moves to the left along the direction of the guide holes 62a and 62b, and shifts to the state shown in FIG. Further, when the rotor 42 rotates counterclockwise, the drive pin 33a leaves the drive section 63ad and enters the non-drive section 63an, and the drive pin 33b exits the non-drive section 63bn and enters the drive section 63bd. Thus, the aperture state is shifted to that shown in FIG. As described above, the present invention can also be employed in so-called guillotine shutters.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible.

  You may employ | adopt this invention to the blade | wing which makes the opening formed in the board | substrate fully closed. An ND (Neutral Density) filter may be attached to the aperture opening formed in the blade.

  Although the example which formed the blade | wing 20 with the film for general light reflection prevention and the light shielding film was shown in the said Example, you may use the blade | wing shape | molded with resin.

It is a perspective view of the blade drive device concerning this example. It is a perspective view of the blade | wing drive apparatus which abbreviate | omitted the board | substrate partially. It is a front view of a blade | wing. It is a front view of the blade drive device in the fully open state. It is a front view of the blade | wing drive device in the middle of the transition between a full open and a small aperture state. It is a front view of the blade drive device in the small aperture state. It is a front view of the conventional blade | wing drive apparatus in a full open state. It is a front view of the conventional blade | wing drive device in a small aperture state. It is a front view of the blade drive device concerning Example 2 in a full open state. It is a front view of the blade | wing drive device which concerns on Example 2 in the middle of the transition between a full open and a small aperture state. It is a front view of the blade | wing drive device which concerns on Example 2 in a small aperture state.

Explanation of symbols

1, 1A Blade driving device 10, 50 Substrate 11, 51 Opening 12a, 12b, 52a, 52b Guide pin 13, 53 Escape hole 20, 60 Blade 21, 61 Diaphragm opening 22a, 22b, 62a, 62b Guide hole 23a, 23b, 63a, 63b Engagement holes 23ad, 23bd, 63ad, 63bd Drive section 23an, 23bn, 63an, 63bn Non-drive section 30 Drive member 32 Arm 33a, 33b Drive pin 40 Electromagnetic actuator

Claims (5)

A substrate having an opening;
A blade that is supported so as to be linearly movable and adjusts an opening amount of the opening; and a blade having first and second engagement holes;
A driving member for rotating the predetermined range to drive the blade;
An arm provided on the driving member and transmitting the driving force of the driving member to the blades;
The blade drive device according to claim 1, wherein the arm is provided with first and second drive pins that engage with the first and second engagement holes, respectively.   2. The blade driving device according to claim 1, wherein the first and second driving pins are arranged in a circumferential direction centering on a rotation center of the arm.   3. The blade driving device according to claim 1, wherein the first and second engaging holes are provided along each other. The first engagement hole includes a drive section in which power of the first drive pin is transmitted to the blades, and a non-drive section in which power of the first drive pin is released.
The second engagement hole includes a drive section in which power of the second drive pin is transmitted to the blades, and a non-drive section in which power of the second drive pin is released,
4. The blade driving device according to claim 1, wherein when one of the first and second driving pins is positioned in the driving section, the other is positioned in the non-driving section. 5. The driving member and the blade are positioned so as to sandwich the substrate,
5. The blade driving device according to claim 1, wherein the substrate has a single escape hole for allowing the first and second drive pins to escape.

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